Production tooltips: styled tooltips everywhere, shortcuts surfaced, dev-speak culled

Owner-approved full pass (tooltip wave, 2026-09-25). Mechanism: icon/pill
controls ride the styled Radix tooltip via a new Hint composition
(components/ui/hint.tsx) — the shared primitive adopted as-is, no
restyling; the shortcut appends as an em-dash suffix off the LIVE registry
(a rebind in Settings → Keyboard changes the suffix): "Dictate — ⌘D".
Surface-owned keys (Esc closes, Enter submits) ride a raw binding prop.
Native title= stays only for truncation-reveals (dock spans, the rename
field) and menu-interior abbreviations (MenuShell untouched). One
em-dash pattern; per-state truth on the send square (busy = "Stop the
reply — Esc", idle = "Send — ↵"), Enter on the plan verdict's accept,
"Stop dictation (Esc)" kept verbatim per the owner's flag.

Copy: the dev-speak cull — no pipeline/prober/tier/wave vocabulary
anywhere a user reads. New pins in tests/tooltip-mechanism.test.tsx
(hintText composition, asChild no-wrapper-DOM, the auto-update hint
constant); dock truncation titles pinned native; graph-chrome + settings
pins updated to the new copy.

Live-verified on :3001 — 12.6ms hover appearance (no native 1s lag);
glyphs render on every suffixed surface (⌘D, ⌘K, ⌘⇧F, ⌘,, ⌘B, F2, ↵,
Esc); per-page probes confirm Settings entry, Home logo, session search,
Start session, Close sidebar, model + thinking pills, stats summary,
rename title, plan chip, coverage ring, send square, cost button, node
search (⌘F), graph gear, settings close (Close — Esc), keyboard section
"Fixed — part of this screen", auto-update hint, light-mode "Coming
soon", the three slot rosters, graph-tools hint. Esc still closes the
settings dialog.

components/session-overlay.tsx

@@ -6,6 +6,7 @@ import { cn } from "@/lib/utils";
 import { fitGraphView, fitZoomFor, zoomedGraphView, type Viewport } from "@/components/pan-zoom";
 import { renderMermaid } from "@/components/mermaid-render";
 import { MermaidError } from "@/components/mermaid-error";
+import { Hint } from "@/components/ui/hint";
 
 /**
  * SESSION-SCOPED OVERLAYS (owner wave, 2026-09-19): the "fullscreen"
@@ -181,7 +182,8 @@ export function MermaidOverlay({ chart, onClose }: { chart: string; onClose: ()
 			<div className="mb-2 flex items-center gap-2">
 				<span className="text-sm font-medium">Diagram</span>
 				<span className="text-xs text-muted-foreground">from this lesson</span>
-				<button
+				<Hint label="Close" binding="escape" side="left">
+<button
 					type="button"
 					onClick={onClose}
 					aria-label="Close"
@@ -190,6 +192,7 @@ export function MermaidOverlay({ chart, onClose }: { chart: string; onClose: ()
 				>
 					<XIcon className="size-4" />
 				</button>
+</Hint>
 			</div>
 			<div
 				ref={viewportRef}
@@ -238,33 +241,36 @@ export function MermaidOverlay({ chart, onClose }: { chart: string; onClose: ()
 						<div className="pointer-events-none absolute inset-x-0 bottom-0 flex items-end justify-between p-2">
 							<span className="text-xs text-muted-foreground/60">Drag to pan · scroll to zoom</span>
 							<div className="flex gap-1">
-								<button
+								<Hint label="Zoom out" side="bottom">
+<button
 									type="button"
-									title="Zoom out"
 									aria-label="Zoom out"
 									onClick={() => stepZoom(1 / 1.25)}
 									className="pointer-events-auto flex size-7 items-center justify-center rounded-md border border-border/70 bg-card/80 text-muted-foreground backdrop-blur transition-colors hover:bg-accent hover:text-foreground"
 								>
 									<MinusIcon className="size-3.5" />
 								</button>
-								<button
+</Hint>
+								<Hint label="Fit diagram to view" side="bottom">
+<button
 									type="button"
-									title="Fit diagram to view"
 									aria-label="Fit diagram to view"
 									onClick={fitView}
 									className="pointer-events-auto flex size-7 items-center justify-center rounded-md border border-border/70 bg-card/80 text-muted-foreground backdrop-blur transition-colors hover:bg-accent hover:text-foreground"
 								>
 									<MaximizeIcon className="size-3.5" />
 								</button>
-								<button
+</Hint>
+								<Hint label="Zoom in" side="bottom">
+<button
 									type="button"
-									title="Zoom in"
 									aria-label="Zoom in"
 									onClick={() => stepZoom(1.25)}
 									className="pointer-events-auto flex size-7 items-center justify-center rounded-md border border-border/70 bg-card/80 text-muted-foreground backdrop-blur transition-colors hover:bg-accent hover:text-foreground"
 								>
 									<PlusIcon className="size-3.5" />
 								</button>
+</Hint>
 							</div>
 						</div>
 					</>